Compare your tracks to the correct version (pictured). Remember the letters where the track needs to be changed. Pull the levers at (Q) and (R) so that the bright red arrows match. Examine the levers to find the corresponding letter.

Return to (P) and check points settings. Click start.

If you fail and manage to put the mine cart in water, you will need to pick another glowing fungus to put into the mine cart.

Your character will say something about the cart being somewhere useful when the puzzle is complete.

Make your way back to the very first cave room in the same way you came. You can use the Drakan's medallion for quicker access if you have it, to teleport to Burgh de Rott